Bug 13021: guarantor search - main patch

Bug 13021: guarantor search - main patch

This patch is the main patch.
The "common" template is improved to allow different type of picking:
"add" or "select".
The first one appends a patron to a list, the second one selects the
patron and close the result search window.

The members/guarantor_search.pl has completly changed but is quite the
same file as acqui/add_user_search.pl. Both should exist: they don't
belong to the same module (acqui vs members), the picking type is
different (add vs select) and the columns are not the same.

The changes in the common template are very powerful, it's now possible
to list the column we want! This will be very useful for further
reusability.

Before this patch, all patrons mathing the pattern were return. Now only
the first 20 are (depends on the DataTables selected value).

For QA: This patch introduces a new template plugin "To", for now it
permits to convert a perl structure to json. In the idea, it could
permit to convert foo to bar too.

Test plan:
1/ Verify there is no regression in the guarantor search. When the
selection has been done, all data from the guarantor should fill the
form in the "main address" section.
Note that the request is done when the search input in not empty and the
user stop to write for 1 sec.
2/ Verify there is no regression on the 2 other pages where this patron
search is used: link a patron to an order and to a basket (in the
acquisition module).

Signed-off-by: Morag Hills <the.invinnysible.one@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>